Door-operating mechanism.



W. S. CUMMING.

110011 OPERATING MECHANISM.

APPLICATION FILED MAR. 3, 1910. 1,000,784. Patented Aug. 15, 1911.

2 SHBETS-SHEET 1.

Patented Aug. 15, 1911.

2 SHEETS-SHBET 2.

W. S. G'UMMING.

DOOR OPERATING MECHANISM.

- APPLICATION FILED MAE. s, 1910. 1,000,784.,

q/vdwaoow wILLIara's. curamne, or cnrcaeo, rnnrnors, assrenon 'ro wrmzuaim at. nza'vas, or

KANSAS orrv, inrssorm'r.

DOOR-OPERATING" MECHANISM.

Specification-of Letters Patent.

Paten Augai d, rem.

Application filed March 3, 1910. Serial No. 547,160.

MING, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Door-Operating Mechanism, of which the following is a specification.

The invention relates to a door operating mechanism.

The object of the present invention is to provide simple and comparatively inexpen sive mechanism for operating sliding doors, gates and similar closures, and to equip suchlin'echanism with means for automatically checking the closing movement of a gate or door at the end of such movement, whereby injury to persons and the slamming of gates and doors are prevented;

With these and other objects in View, the invention consists in the construction and novel combination of parts hereinafter fully described, illustrated in the accompanying drawings, and pointed out in the claims hereto appended; it being understood that various changes in the form, proportion, size and minor details of construction, within the scope of the claims, may;l

to without departing from t e s irit or sacrificing any of the advantages o the invention. v

In the drawmgs:F1gure-'1 1s an elevat1on of a door operatlng mechanism, constructed in accordance with this invention.

Like numerals of reference designate corresponding parts in all the figures of the drawings.

In the embodiment of the invention.- illustrated in the accompanying drawings, 1 designates a reciprocatory piston rod, provided at its ends with pistonheads 2 and 3? of different areas operating in cylinders 4-and 5 of diflerent diameters. The cylinders 4 and 5 are provided with upper and lower ears or flanges 6 and 7, -which are be resorted bolted 1 or otherwise secured to an attachin plate 8, designed to be secured to a s'ultable support at one side of a sliding door 9. The piston head 2, which is smaller than the piston head 3, is located at the end of the piston 'rod' nearer the 'door, and the larger piston head is located at the other end of-the piston rod.

The cylinders are arranged in spaced relation, and compressed airor other fluid under pressure is admitted to the outer or pressure end of the smaller cylinder 4 from head not the cylinder at the center thereof, Ihe feed vpipe is connected by a branch 12 with the outer end of the larger cylinder 5, the branch-12 piercing the center of the outer head 13 of the larger cylinder and being provided at a point intermediate of its ends with a two-way valve 14. The feed pipe 10 maintains a-constant ressure in the outer end of thei smaller cylinderand the two-way valve 14, which may be or any preferred construction, is adapted to be operend of the larger cylinder, or to connect the phere for exhausting the pressure. he air connected wit the two-way valve, and when thelatt-er is arran ed for exhausting the air from "the large cy inder, the piston is actuated by the res sure exerted against the smaller piston ead and the door is moved in one direction. When the valve 14 is operated to close the exhaust pipe "and admit essure to the outer end of the larger cyliner, .the piston owin to the increased pressure on the larger piston head is moved in t piston head 2, and when the larger piston ead moves away from the inner end of the a feed pipe 10, having a portion piercing the ated either to admit pressure to the outer outer end of the cylinder with the atmos-- escapes throu ha suitable exhaust pipe 15,v

the opposite direction against the constant cylinder 5, a vacuum or partial vacuum will .be created in the latter at the vacuum s de of the said piston head 3. By creatlng a vacuum or partial vacuum in this manner,

the movement of the piston rod is retarded and a slow positive opening and closing movement of'the door is secured-in order to avoid injury to persons and to prevent the door from slamming.

The piston rod carries with it in its movement an oscillatory lever 18, connected at its outer end with the door by a link rod 19,.

and provided at its inner end with a' toothed sector-shaped head 20, mounted between. a

.pair of plates or members 21, which are secured to the piston rod at the center thereof.

head'of the lever 18, and the said toothed head meshes with a fixed rack 27 whereby when the piston rod is reciprocated, the pis ton will be moved longitudinally of thefixed rackand will be partially rotated to effect an.

oscillation of the door actuating lever 18. When the piston is moved from right to left from the position illustrated in Fig. 3 of the drawings, the lever will be swung to the left as indicated by the arrows in Fig. 3. The gear element of the lever meshes directly with the fixed rack, so that the lever and the door will move in the same direction as the iston, thereby reducingthe length of the ever to the extent of the stroke of the piston.. This will enable a shorter lever to be employed for actuating the door. The rack 27 is supported by and extends across the space between the cylinders, and is located at the bottom of the same. It extends between the spaced plates or members 21, and

it is secure at one end to the cylinder 4 adacent to a lug 28 thereof, and its otherend- 1s bolted to a supporting lug 29, extending.

from the inner end of the larger cylinder 5.

The piston is equipped with a friction device composed of spaced friction plates or members 30, arranged in pairs and located at o posits sides of the center of the piston ro and at opposite sides of the plates or'members 21. The friction plates are connected to upper and lower bars or pieces 31 by bolts 32, having a head ,33 at one end and a thumb nut 34 at the other end. Coiled springs 35 are inter osed between the ends of the friction p ates and the said heads and nuts 34, and. operate to press the friction plates tightlyagainst the side 'faces of the piston rod 1. The connecting bars or pieces are of a length greater than'the width of the supporting plates or members 21, so that the friction device will come in contact with one of the cylinders on each. stroke of the piston rod prior to the completion of such stroke, and the fric tion device will thereby operate to' check the latter port-ion of the movement of the mechanism. .The completion of the inovea ment of the piston carries the supporting plates or members '21 against the pair of friction plates, which are in contact with the contiguous cylinder and spaces them from the other pair of friction plates, so that the friction device will be in position for operation on the next stroke of the piston. The friction device is provided at the abutting edges of the friction plates with cushions 36 of rubber, leather, or other suit- 'able material to prevent noise when the friction device engages the ends of the cylinders. In the accompanying illustration the oscillatory door operating lever is shown beneath the cylinders in avertical position, but it may be arranged above the cylinders, if desired, and the feed pipes maybe located in any convenient position.

.Having thusfully described my invention, what I claim as new and'desire to secure by Letters Patent, is.

1. A door operating mechanism comprising a reciprocatory motor actuated rod, spaced supporting lates secured to the rod, a fixed rack extending through the space between the supporting plates, and a door operating lever mounted between and carried by the supporting plates and having a gear element meshing with the rack bar.

2. A door operatin mechanism including" a motor actuated reciprocatory rod, mechanism for connecting the rod with the door,

a. friction device carried by the rod and adapted to engage a stop for checking the movement of the rod. v

3. A door operating mechanism including a motor actuated reciprocatory rod, mechanism for connecting the rod with the door, and afriction device for checking the movement of the rod having friction members yieldably, clamping the rod and movable with respect thereto.

4. A door operating mechanism including i a motor actuated reciprocatory rod, mecha- 12o nism for connecting the rod with the door, and a friction device for checking the movement of the rod having opposite spring aciiuated plates yieldably clamping the said r0 5. A door operating mechanism including a motor actuated reciprocatory rod, mecha-. nism for connecting the rod with the door and a friction device for checking the movementof the rod and having opposite spring 130.

operating plates arranged in pairs and con-- nected together so as to move in unison on the rod.

6. A door operating mechanism including a motor actuated reciprocatoryrod, mechanism for connectingthe rod with the door, and a friction device comprising friction plates arranged at opposite sides of the reciprocatory rodand yieldably engaging the same, said plates being disposed in pairs and connected together and having a lim-. ited movement on the rod independently device mounted on the said rod and composed of spaced friction plates arranged in pairs at opposite sides of the support, the members of each pair being located at opposite sides of the rod, bars connecting the pairs of .plates, fastening devices piercing the bars and the plates, and springs mounted on the fastening devices and yieldably maintaining the plates in engagement with the motor actuated rod.

In testimony, that I claim the foregoing as my own, I have hereto aflixed my signature in the presence of tWo witnesses.

WILLIAM s. CUMMING.

Witnesses:

F. P. COLLIER, D. F. HAMLINK. 

